Throttle-valve.



llaman Startins Parham Ormes.

GEORGE II. GOODELL, OF ST. PAUL, MINNESOTA, AND PIERRE L. LOBEZ, OF VILMERDING, PENNSYLVANIA.

THROTTLE=VALV.

SPECIFICATION forming part of Letters Patent No. 645,084, dated March 13, 1900. Application het Aug-.1a 4, i899. seen no. 726,113. (No maar.)

T0 all whom, it may concern:

Be it known that we, GEORGE H. GooDELL, residing at St. Paul, in the county of Ramsey and State of Minnesota, and PIERRE L. LoBnz, residing at VVilmerding, in the county of Allegheny and State of Pennsylvania, citizens of the United States, have invented a certain new and useful Improvement in Throttle-Valves, of which the followingis such a full, clear, and exact description as Will enable any one skilled in the art to which it appertains to make and use 4the same, reference being had to the accompanying drawings, forming part of this specification.

Throttle valves have heretofore usually been constructed in one piece, and in all cases, so far as we are aware, the seat for the out- Wardly-openin g valve has been made integral with the walls of t-he throttle-,valve chamber. When they are constructed in that manner, it is necessary to have the opening at the top of the valve-seat large enough for the passage of the bottom portion of the valve, and this mode of construction necessitates a considerable difference between the area of the top portion of the valve and the portion of the bottom which is exposed when the valve is seated. This difference of area on large modern locomotives is often as great as ten square inches, and in such a case, Where the boiler-pressure is one hundred and eighty pounds or more per square inch, aforce capable of lifting eighteen hundred pounds is required to unseat the valve.

The object of our invention is to enable the relative areas of the top and bottom of a throttle-valve to be proportioned in any desired manner and the difference in pressure reduced, so that it will be no greater than is useful for the purpose of keeping the valve seated until it is desired to open it. We attain this object by the mechanism illustrated in the annexed drawings, in which- Figure 1 is a vertical longitudinal section on line 1 1 of Fig. 2. Fig. 2 is a plan view of a throttle-pipe and throttle-valve embodying our improvement. Fig. 3 is a view of our improved valve, partly in vside elevation and partly in vertical section. Fig. 4 is a detailed plan view of our improved valve; and Fig. 5

is a vertical cross-section on line 5 5, Fig. 2, with the valve omitted.

Similarletters refer to similar parts throughout the several views.

A represents a throttle-pipe having a valve-v chamber A', With a bottom inlet-port a and a top port a'. The port ct is shown surrounded by a valve-seat a2 of common form,which may be madeintegral With the Walls of the throttle- Valve chamber, if desired. The top of the valve-chamber A contains an opening a3, large enough to permit the bottom of the throttlevalve B, hereinafter described, to pass down to the seat o2. This opening, with the exception of the port a', is closed by a plate or ring A2, in which the port o' and a surrounding seat a4 is formed and is fastened in place after the valve is introduced into the chamber A by means of studs a5 or other suitable means. The seat a4 is preferably, but not necessarily, givenl the usual annular form, with sides flaring outward.

B represents a throttle-valve having a body B' of common form. The part Which.rests on the lower valve-seat, which We will term the bottom valve b, may be formed integral with the body B', if desired; but the part resting on the top valve-seat, Which We will term the top valve, is formed of a separate piece and preferably of a removable plate B2, preferably pierced by a central hole b2 and having its periphery b2adapted to rest on the top valve-seat a4. in place by any suitable means.` The means preferred is an upward extension b4 of the body B', Which passes through a central hole b2 in said plate and is provided with a nut b5, adapted to prevent the plate from escaping. The nut may, if desired, be locked in place by set-screws h6; but that forms no part of our invention.

In putting the parts together the plate A2 may be slipped over the valve-body B before the plate B2 is put in place. The valve may then be inserted in the chamber A', and the plates A2 and B2 may then be fastened in their respective places.

Having fully described our invention, what we claim as new, and desire to secure by Letters Patent of the United States, is

The plate B2 may be held IOO l. The combination in a throttle-valve, of a Valve-casing, a Valve body or stem, an inwardly-opening valve carried by said body or stem, an outwardly-opening valve also eariied by said body or stem, and a valve-seat for said outwardly-opening Valve removably secured to said valve-easing.

2. The combination in a throttle-Valve, of a Valve-casing, a Valve body or stem, an inwardly-opening Valve carried by said body or stem, an outwardly-opening Valve also oarried by said body or stem, one of said Valves being removable from said body or stem, and a valve-seat for said outwardly-opening valve removably secured to said Valve-casing.

3. The combination in a throttle-Valve, of

a Valve-easing, a valve body or stern, an invWardly-opening valve carried by said body or stem, an outwardly-opening Valve removably secured to said body or stem, and a Valveseat for-said outwardly-opening Valve removably secured to said valve-casing.

GEORGE H. GOODELL. PIERRE L. LOBEZ. y Witnesses to the signature of George H. Goodell:

W. M. DE LAMBRY, OLIVE HAsTINGs. Witnesses to the signature of Pierre L. Lobez:

CARL B. AUEL, JOHN B. WRIGHT. 

